Mechanical pencil



fill-72 Dec. 26, 1939.

L. J. MOST MECHANICAL PENC IL Filed larch 18, 1939 .Q arch Room PatentedDec. 26, 1939 Search Roon PATENT OFFICE MECHANICAL PENCIL Lucifer J.Most. Hudson County, N. J.

Application March 18, 1939, Serial No. 262,591

2 Claims.

My invention relates to a mechanical pencil, and is a modification ofthe structure as disclosed in my pending application, Serial No.209,739, filed May 19, 1938.

The object of the invention is to provide a simple mechanism, formed offew moving parts, for propelling, retracting, expelling andautomatically presenting a new lead to writing position.

Another object of the invention is to provide a mechanical pencil inwhich the lead itself is a part of the feed mechanism.

A still further object of the invention is to provide a mechanicalpencil where the feeding can be done generally with the fingers holdingthe pencil in writing position.

In the appended drawing, forming part of this application, Figure 1 is afragmentary elevation, partially in section.

Figure 2 is an enlarged cross-section on line 22, Figure 1.

Figure 3 is an enlarged cross-section on line 3-3, Figure 1.

Figure 4 is an enlarged cross-section on line 4-4, Figure 1.

Figure 5 is a section through the die and guiding tubes on line 5-5,Figure 4.

Figure 6 is a fragmentary elevation of a modified form of the pencilend, as shown in Figure 1, and

Figure 7 is a section on line 1l, Figure 6.

Referring to the drawing, I0 is the pencil shell or barrel formed with ahollow tip H, terminating in an opening l2, through which a lead mayprotrude. The tip H is provided with lateral cut-outs or openings l3which are diametrically opposite, and through which the nut or die I4 isaccessible for manipulation.

The die is maintained in proper register with the openings l3 by spacedtubular members I5 and I8 of angular cross-section, corresponding to theangular cross-section of the lead they are to engage, in this particularcase the lead being square. The lower tube I5 is anchored in the tip IIby a washer plug IS.

The die M has a circular recess I! which houses a portion of the tubel5, permitting the die to revolve freely relative to said tube. Asimilar recess I1 is formed on the opposite end of the die l4 toaccommodate the lower end of the tubular member l8, the upper end of thetubular member l8 terminating with a hopper I9, which constitutes thebody of the magazine for leads formed by the hopper with the barrel l0.

It will be seen that the die 14 positioned between the spaced tubularmembers l5 and I8 is free to revolve relatively to said tubular members,but prevented from moving longitudinally thereof, and is maintained bysaid tubular members in proper register with the lateral openings l3 inthe barrel. To assure proper axial and angular alignment of the twotubular members l5 and I8, a washer 20 is provided between the tubularmember 18 and the interior of the tip H.

The threaded portion 2| of the bore of the die lying between therecesses I1 is formed to engage the corners of the lead, which ispresented thereto by the tube l8. This tube, due to its cross-section,prevents the lead from turning when the die I4 is revolved relativelythereto, and as the lead progresses through the die it will enter thelower tubular member l5, which aligns with the tube l8; as the leadprogresses through the tube it can pass through the opening l2 in thetip H. To prevent a lead section 22 passing beyond the die H fromdropping out from the tubular member IS, the lower end of the tube or ofthe tip is made to frictionally engage the lead therein, and theadvancing of that section of the lead, which remains in the tube I5, isobtained through the succeeding lead which passes the die l4 to enterthe tube l5.

The position of the die I 4 being such that it lies in proximity of thefingers engaging the pencil in writing position, the manipulation of thelead in the pencil, therefore, can be done by the fingers while in thatposition.

In the modified form shown in Figures 6 and 7, the shoulders of thelateral apertures 13' are rounded up inwardly to provide a better accessto the die M by flattening and rounding oflf the shoulders of thelateral openings I3.

I claim:

1. In a mechanical pencil, a barrel having a lead outlet, a pair ofaligning spaced tubular members of angular cross-section fixed in thebarrel in proximity of the outlet and aligning therewith, a threaded diepositioned between the tubular members and having annular recessesaccommodating the proximate ends of the tubular members, so that thesaid die is free to revolve relatively to said members, but preventedfrom moving longitudinally, said barrel having lateral openings givingaccess for the manipulation of the die, and a hopper rising from thetubular member above the die forming with the barrel the magazine forleads.

2. In a mechanical pencil, a barrel terminating with a tip, a pair ofspaced aligning tubular members of angular cross-section located in saidtip and co-axial therewith, a threaded die positioned between thetubular members co-axial therewith and having an annular recessaccommodating the proximate ends of the tubular members so that thissaid die is free to revolve relatively to said tubular members, butprevented from longitudinal movement thereof, said tip having meanswhereby access may be had to said die from the lateral side of said tip,and a hopper forming part of the upper tubular member in the tip, andengaging the barrel to a lead magazine.

LUCIFER J. MOST.

